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December Weather in Illgau, Switzerland

Last updated: August 27, 2025

In December, the average temperature in Illgau, Switzerland hovers around -2°C (29°F), with extremes ranging from a chilly -15°C (6°F) to a mild 8°C (47°F). Expect significant precipitation, averaging 190 mm (7.5 in) across about 19 days, and prepare for high humidity levels of around 90%. Stay bundled up and ready for the damp conditions!

December Temperature in Illgau

In December in Illgau, the average temperature is -2°C (29°F), with maximums reaching 8°C (47°F) and minimums dropping as low as -15°C (6°F). Travelers should be prepared for chilly weather and pack warm clothing for their visit.

December Weather in Illgau: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Illgau, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Illgau, December typically has an average temperature of -2°C (29°F), with highs reaching up to 8°C (47°F) and lows dropping to around -15°C (6°F).
JanFebMarAprMayJunJulAugSepOctNovDec252934414757595952453528
Data source: Temperature data for Illgau generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Illgau

In Illgau in December, the precipitation amount is 190 mm (7.5 in) over a period of 19 days.

December Precipitation Trends in Illgau

The chart displays monthly precipitation patterns in Illgau, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Illgau, December typically receives around 190 mm (7.5 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec154108136114190229208231168162102190
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Illgau

In Illgau in December, humidity is 90%. With an average temperature of -2°C (29°F), this humidity feels like an icy breath enveloping you, making every step outdoors feel even colder and more biting, while also creating a heavy, wet atmosphere that can dampen your spirits for traveling.

December Average Humidity in Illgau

This chart illustrates the average monthly humidity levels in Illgau, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Illgau is approximately 90%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%89%87%84%80%82%83%80%83%90%89%90%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Illgau

In Illgau in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Illgau, you can visit Hourly UV Index in Illgau.

Maximum UV Index Levels in Illgau for December

The chart shows the monthly maximum UV Index (UVI) for Illgau in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Illgau typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357810986432
Data source: Illgau December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How December Weather in Illgau Compares to Other Months

Weather in Illgau varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Illgau, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Illgau, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)154 mm (6.1 inches)92%low
February Weather-2°C (30°F)108 mm (4.2 inches)89%moderate
March Weather1°C (34°F)136 mm (5.3 inches)87%moderate
April Weather5°C (41°F)114 mm (4.5 inches)84%high
May Weather8°C (48°F)190 mm (7.5 inches)80%very high
June Weather14°C (57°F)229 mm (9.0 inches)82%very high
July Weather15°C (59°F)208 mm (8.2 inches)83%very high
August Weather15°C (59°F)231 mm (9.1 inches)80%very high
September Weather11°C (52°F)168 mm (6.6 inches)83%high
October Weather7°C (45°F)162 mm (6.4 inches)90%moderate
November Weather2°C (35°F)102 mm (4.0 inches)88%moderate
December Weather-2°C (29°F)190 mm (7.5 inches)90%low

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